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Conferences Fresco Painting Plaster Arts & Modern Plasters and Classic Plaster Finishes Topic #23
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Filip
unregistered user
 10-Jul-03, 02:06 PM (PST)
 
""gypsum plaster""
 
   Hi,
I am wondering if I apply aged lime putty mortar over already existing "gypsum plaster" (it is placed on metal lath). Is it going to be some dangerous effect for my fresco painting. Usually how long need efflorescence to shows on surface. Or is it going to be problem for lime mortar to setting over it. I would like to know some more about that, is that permanent enough or is possible after longer time salt from base coat to destroy surface.
Thanks for help!
Filip


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Iliamoderator
Charter Member
339 posts, Rate this user		 10-Jul-03, 02:44 PM (PST)
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1. "RE:"
In response to message #0
 
>Hi,
>I am wondering if I apply aged lime putty mortar
>over already existing "gypsum plaster" (it is
>placed on metal lath). Is it going to be some
>dangerous effect for my fresco painting. Usually
>how long need efflorescence to shows on surface.
>Or is it going to be problem for lime mortar to
>setting over it. I would like to know some more
>about that, is that permanent enough or is
>possible after longer time salt from base coat
>to destroy surface.


all of the above, plus it might just fall off when dry.
Calcium does not quite like to stick to anything but calcium. You better off using type S lime from home depot for base plaster coat, if you are looking for savings... it will also set faster and harder.

However for large frescoes "cheating" is like shooting yourself in the foot, so keep that in mind.

iLia

http://FrescoSchool.com

ilia

http://www.FrescoSchool.com


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